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WO2009067858A1 - Procédé de pré-désactivation et procédé de désactivation pendant la réaction initiale d'un appareil de reformage en continu - Google Patents

Procédé de pré-désactivation et procédé de désactivation pendant la réaction initiale d'un appareil de reformage en continu Download PDF

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Publication number
WO2009067858A1
WO2009067858A1 PCT/CN2008/001819 CN2008001819W WO2009067858A1 WO 2009067858 A1 WO2009067858 A1 WO 2009067858A1 CN 2008001819 W CN2008001819 W CN 2008001819W WO 2009067858 A1 WO2009067858 A1 WO 2009067858A1
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Prior art keywords
reforming
gas
hydrogen
reaction
reactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2008/001819
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English (en)
Chinese (zh)
Inventor
Jieguang Wang
Aizeng Ma
Jianqiang Ren
Changqing Ji
Xinkuan Zhang
Hengfang Chen
Yajun Zhao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
Original Assignee
Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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Publication date
Priority claimed from CN200710176571A external-priority patent/CN101423774B/zh
Priority claimed from CN 200710178229 external-priority patent/CN101445746B/zh
Application filed by Sinopec Research Institute of Petroleum Processing , China Petroleum and Chemical Corp filed Critical Sinopec Research Institute of Petroleum Processing
Priority to US12/740,458 priority Critical patent/US8475650B2/en
Priority to RU2010119051/04A priority patent/RU2470065C2/ru
Priority to EP08854893.8A priority patent/EP2210929B1/fr
Publication of WO2009067858A1 publication Critical patent/WO2009067858A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G35/00—Reforming naphtha
    • C10G35/04—Catalytic reforming
    • C10G35/06—Catalytic reforming characterised by the catalyst used
    • C10G35/085—Catalytic reforming characterised by the catalyst used containing platinum group metals or compounds thereof
    • C10G35/09—Bimetallic catalysts in which at least one of the metals is a platinum group metal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G35/00—Reforming naphtha
    • C10G35/04—Catalytic reforming
    • C10G35/06—Catalytic reforming characterised by the catalyst used
    • C10G35/065—Catalytic reforming characterised by the catalyst used containing crystalline zeolitic molecular sieves, other than aluminosilicates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G35/00—Reforming naphtha
    • C10G35/22—Starting-up reforming operations
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities
    • C10G2300/207—Acid gases, e.g. H2S, COS, SO2, HCN
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/30—Physical properties of feedstocks or products
    • C10G2300/305—Octane number, e.g. motor octane number [MON], research octane number [RON]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/70—Catalyst aspects
    • C10G2300/705—Passivation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
    • C10G2400/02—Gasoline
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
    • C10G2400/30—Aromatics

Definitions

  • a passivation method for pre-passivation and initial reaction of a continuous reforming device is provided.
  • the invention relates to a method for pre-passivation and initial reaction passivation of a continuous reforming device, in particular to a passivation method of a reaction device before or during a feed reaction of a continuous reforming device.
  • the continuous regenerative catalytic reforming of naphtha is highly valued in the production of high-octane gasoline and aromatic hydrocarbons due to its high liquid recovery, high hydrogen yield and high aromatic yield.
  • the reforming catalyst used in the continuous reformer is a series of dual or polymetallic catalysts containing platinum tin, which is more sensitive to platinum-tin catalysts than platinum-only catalysts. Therefore, to ensure the normal operation of the catalytic reformer, there is a strict limit on the sulfur content in the reforming feedstock.
  • CN1234455C US Pat. No. 6,495,487 B1 and US Pat. No. 6,780,814, B2 disclose the use environment requirements of a platinum-tin multimetal reforming catalyst, and indicate that during normal operation of the continuous reforming reaction, the naphtha feedstock for reforming is subjected to catalytic desorption and adsorption. The way to remove sulfur from the oil to the lowest level, the best sulfur-free.
  • the platinum-tin series reforming catalyst requires the control index of the impurity content of the reforming raw material, and the sulfur content is generally controlled to be not more than 0.5 g/g.
  • Continuous reforming operation pressure is relatively low, reaction temperature is high, hydrogen/oil is relatively low, and the device is more likely to coke during the reaction.
  • continuous reforming has continued to increase in the direction of ultra-low pressure, low hydrogen/oil ratio, low space velocity, etc., and the tendency of the reactor and the heating furnace tube to coke is also increasing.
  • multiple sets of continuous reformers have been subjected to reactor wall coking. Coking can cause poor catalyst flow, damage to internal components of the reactor, and even equipment downtime, which can result in significant economic losses to the refinery.
  • Catalytic Reforming Process and Engineering (first edition, November 2006, China Petrochemical Press), pp. 522-534, analyzes the mechanism of coking in a continuous reformer: hydrocarbon molecules are adsorbed in a reducing atmosphere
  • the surface of the metal grains of the reactor wall is excessively dehydrogenated to form carbon atoms under the metal catalysis of the wall, and is dissolved or infiltrated into the grains or between the particles of the metal. Due to The deposition and growth of carbon separates the metal grains from the matrix, resulting in a filamentous carbon with metal iron particles at the front end. This carbon is obviously different from the carbon deposit on the catalyst, and has high catalytic dehydrogenation and hydrogenolysis activity.
  • the filamentous carbon becomes longer and thicker. Harden.
  • the development of filamentous carbon generally goes through several stages of development of soft carbon, soft bottom carbon and hard carbon. The longer the formation time, the more serious the consequences.
  • the circulation system may be blocked and cannot be circulated normally; in severe cases, the internal components of the reactor such as the scallop and the center tube may be damaged. If the generated coke enters the regeneration system, it will cause local over-temperature of the scorch zone of the regenerator and over-temperature of the oxychlorination zone to burn out the internal components of the regenerator. The degree of damage to the reactor and regenerator internal components becomes more severe as the operating time increases.
  • the continuous reforming operation is based on the refinery material balance, hydrogen balance and product requirements.
  • the severity of the reaction is increased quickly when the water in the gas is qualified.
  • the sulfur content of the reforming feed is controlled between 0.2 and 0.5 g/g, especially for new plants that are used for the first time, not enough to passivate the reactor and the furnace tube wall quickly and fully, and a considerable part of the continuous reformer After the passivation method described above, the coking of the reaction system still occurs during the operation. Therefore, how to effectively suppress the metal-catalyzed coking of the continuous reforming reactor and the heating furnace wall becomes an important subject of continuous reforming technicians.
  • CN1160435C discloses a method for inhibiting coke deposition in a pyrolysis furnace, which is used before introducing hydrocarbon feedstock into a thermal cracking furnace.
  • Sulfur and phosphorus containing compound treatment pyrolysis furnace the sulfur / phosphorus atomic ratio of at least 5, the addition of a sufficient amount of sulfur compounds in the phosphorus compound can form a uniform and effective on the surface of the pyrolysis furnace
  • the passivation layer is used to inhibit the deposition of coke.
  • CN85106828A discloses a method and a device for forming a surface of a metal part, and placing the metal part on a cathode disk of a reaction chamber in a vacuum furnace while being in a vacuum furnace
  • the solid sulfur is placed, and the solid stone is vaporized by heating.
  • the vaporized sulfur bombards the metal part on the cathode disk under the action of the electric field, thereby forming a vulcanized layer on the surface thereof.
  • CN 1126607C discloses a method for inhibiting and slowing the formation and deposition of coke in hydrocarbon pyrolysis, which pretreats a metal surface with a pretreatment agent before injection of the cracking feedstock into the cracking equipment with water vapor, pretreatment
  • the agent is one or a mixture of two or more of hydrogen, an organic sulfur compound, an organic phosphorus, and an organosulfur compound.
  • This method can passivate the metal surface of the cracker to inhibit and reduce coke formation and deposition during the cracking process and subsequent processing.
  • the reforming apparatus provided by the present invention has two passivation methods, one is pre-passivation before the reforming raw material enters the apparatus, and the other is a passivation method in which the reaction raw material enters the apparatus for initial reaction.
  • the pre-passivation method of the continuous reforming apparatus comprises charging a reforming catalyst in a continuous reforming unit, starting a gas circulation and raising the temperature of the reactor, and the reactor temperature is in the range of 100 to 650 ° C. Sulfide is injected into the gas inward, and the sulfur content in the control gas is 0.5 to: l00x l (T 6 L/L to passivate the device.
  • the passivation method for initial reaction of the continuous reforming apparatus comprises the following steps: (1) loading a reforming catalyst in a continuous reforming unit, starting a gas circulation and raising the temperature of the reactor, when the temperature of the reactor When the temperature is raised to 300 ⁇ 460 °C, the reforming feedstock oil is introduced into the reaction system, and the sulfide is introduced into the reaction system simultaneously or after the reforming feedstock oil is introduced, and the total sulfur amount in the introduction system is controlled.
  • the ratio of the reforming feedstock oil is between 0.5 g/g and 50 g/g, and when the hydrogen concentration in the recycle gas reaches 2. ( ⁇ L/L ⁇ 3 ( ⁇ L/L, the deuteration is introduced into the system) Amount,
  • the pre-passivation method of the above reforming device is to inject a chemical into the reaction system under a condition of a certain temperature and a flow of the gaseous medium before the continuous reforming device is introduced into the reaction raw material, by controlling a certain sulfur content in the gas. Passivation of the high temperature vessel and the pipe wall of the reaction system of the continuous reformer can effectively suppress the catalytic coking of the metal wall of the device. More sulfide should be injected into the system, and then the amount of sulfide introduced should be adjusted to make the device operate normally under the specified conditions.
  • the method of the invention can effectively passivate the wall of the reaction device before or at the beginning of the reforming reaction, prevent coking caused by active metal catalysis of the wall, and reduce the operational risk of the device.
  • Figures 1 and 2 are electron micrographs of the carbon blocks collected in Comparative Example 1.
  • Figure 3 is a photograph of the coke at the bottom of the reactor in Comparative Example 1.
  • Figure 4 is an electron micrograph of a coke sample in Comparative Example 2, which is a filamentous carbon with iron particles on top. detailed description
  • a telluride is added to the flowing gaseous medium in the reaction system before the catalyst is charged in the continuous reforming unit, and the high temperature portion of the reactor such as the continuous regenerative reforming unit and the heating furnace tube is added.
  • the wall is sufficiently passivated, and then the reaction device is purged with a gas that does not affect the reaction, so that the sulfur content in the device does not affect the catalytic method.
  • the method of introducing the device before the reforming reaction can inhibit the high temperature hydrogen site.
  • the catalytic activity of the wall metal prevents the catalytic coking caused by the metal wall during the reaction and reduces the operational risk of the device.
  • the process of the present invention pre-passivates the walls of the gas flowing into the gas flowing into the system prior to the oil reforming of the continuous reformer.
  • the recycle gas generally refers to the gas circulating within the system as a passivating medium.
  • the recycle gas is preferably hydrogen, an inert gas or a mixture of hydrogen and an inert gas.
  • the inert gas is preferably nitrogen.
  • the reforming reactor is first charged with a catalyst, pre-twisted
  • the temperature is from 100 to 650 ° C, preferably from 100 to 450 ° C, more preferably from 150 to 300 ° C.
  • Gas circulation is established in the system and the reactor is heated.
  • the inlet temperature of the reactor is raised to 120 to 2 60 ° C
  • the sulfide is injected and the temperature is raised.
  • the inlet temperature of the reactor is raised to 370 to 420 ° C, the temperature is maintained for 1 to 50 hours, preferably 2 to 10 hours.
  • the sulfur content of the gas in the reaction device during the pre-passivation process is controlled to be 0.5 to 100 x 1 (T 6 L/L, preferably 2 to 20 x 1 (T 6 L/L, more preferably 3 to 20 10- 6 L/L, most gas means preferably 3 ⁇ 6x lO_ 6 L / L.
  • the exhaust gas after the pre-passivation, into the reforming reaction does not affect the subsequent replacement of the replacement gas, the exhaust gas to a sulfur content of not greater than 5.0x lO- 6 L / L, preferably When it is not more than 2.0x lO _6 L/L, the reforming reaction is carried out according to the conventional reaction conditions.
  • the replacement gas used for the original circulating gas in the displacement device is hydrogen, an inert gas or a mixture of an inert gas and hydrogen.
  • hydrogen or nitrogen is used.
  • 0.1 to 5.0 MPa preferably 0.35 to 2.0 MPa, temperature 350 to 600 ° C, preferably 430 to 560 ° C, more preferably 490 to 545 ° C, hydrogen/hydrocarbon molar ratio 1 to 20, preferably 2 to: 10, liquid hourly space Speed (LHSV) l ⁇ 10hr _1 , preferably l ⁇ 5hr -1 .
  • LHSV liquid hourly space Speed
  • the sulfide to be injected into the circulating gas is preferably hydrogen sulfide, carbon disulfide, dimercapto disulfide, aliphatic sulfur-containing compound, alicyclic sulfur-containing compound, aromatic sulfur-containing compound, thiophene, morpholine compound or Any two or a mixture of two or more of the compounds, wherein the thiophene or morpholine compound means a derivative of thiophene or morpholine.
  • the injected sulfide is preferably hydrogen sulfide; when the passivation is shielded by hydrogen, the injected sulfide may be hydrogen sulfide or the above organic sulfide.
  • the continuous reforming reaction system in the initial stage of the reaction, is first introduced into the oil at a low temperature, and a certain amount of sulfide is introduced into the reaction system during the temperature rise of the reaction system and the constant temperature dehydration and conditioning operation.
  • the sulfur content entering the system reaches a relatively high level, that is, the ratio of the total sulfur in the controlled introduction system to the reforming feedstock oil is between more than 0.5 g/g and 5 ( ⁇ g/g, when hydrogen sulfide in the recycle gas
  • the sulfur content of the introduction system is further lowered, and after the water content in the system is qualified, the reaction temperature is raised to make the device perform a normal production operation.
  • the manner of introducing the sulfide into the reaction system may be Adding sulfide to the reforming feedstock oil, or adding hydrogen sulfide or hydrogen sulfide-containing gas to the recycle gas, or adding hydrogen sulfide or hydrogen sulfide-containing gas to the recycle gas, and
  • the whole feedstock oil is added with 3 ⁇ 4IL.
  • the hydrogen sulfide-containing gas is hydrogen from a reforming pre-hydrogenation system, or other hydrogen-containing gas having a higher concentration of hydrogen sulfide, the hydrogen-containing gas.
  • hydrogen content of 50 ⁇ 500 ⁇ L / L, preferably 100 ⁇ 200 ( ⁇ L / L, and more preferably 200 ⁇ 80( ⁇ L/L.
  • the continuous reforming reactor and the heating furnace tube wall can be sufficiently and quickly passivated, thereby suppressing the occurrence of coking. Affects the progress of the operation of the device and the reactivity of the catalyst when the continuous reformer is operated under high severity conditions.
  • the step (1) is the low-temperature injection of sulfur after the start of the operation of the device, and the introduction of the device at the same time or after the introduction of the oil at a low temperature, preferably controlling the total sulfur amount and the reforming feedstock in the introduction system.
  • the ratio is 0.6 to 2 C ⁇ g/g, and more preferably 1.0 to: I0 g/g.
  • the hydrogen sulfide content in the recycle gas of the reformer should be periodically checked. When the concentration of sulphuric hydrogen in the recycle gas reaches 2.0 ⁇ 30 ⁇ , preferably 2.0 ⁇ 6.0 ⁇ , it will be introduced into the system. The total amount of sulfide is lowered.
  • the ratio of total sulfur to reformate feedstock introduced into the system is adjusted to 0.2 to 0.5 g/g.
  • step (1) after the total sulfur content in the reaction system is lowered, the ratio of the total sulfur amount in the introduction system to the reforming feedstock oil is reduced to 0.2 to 2. ( ⁇ g/g, preferably (10 g/g) After the concentration of hydrogen sulfide in the gas to be recycled is less than 5. ( ⁇ L/L, preferably 0.2 to 2. C ⁇ L / L, depending on the carbon deposition of the catalyst, the regeneration system can be started to carry out the catalyst regeneration.
  • the sulfide introduced in the step (1) is hydrogen sulfide, carbon disulfide, dimercapto disulfide, aliphatic compound, alicyclic sulfur compound, aromatic sulfur compound, thiazine, morpholine A compound or a mixture of any two or more of the compounds, wherein the thiophene or morpholine compound means a derivative of thiophene or morpholine.
  • hydrogen, thioether, hydrogen sulfide or carbon disulfide is preferred, and the thioether is preferably dimethyl disulfide or dimethyl ketone.
  • chlorides should also be introduced while introducing sulfide into the reforming system.
  • the amount of chlorine injected can be carried out according to the conventional chlorine injection requirements. Generally, when the water content in the circulating hydrogen is greater than 500 L/L, the amount of chlorine injected is 30 to 50 g/g; when the water content in the circulating hydrogen is 300 to 50 ( ⁇ L/L, the amount of chlorine injected is 15 to 3) ( ⁇ g/g; When the water content in circulating hydrogen is 100 ⁇ 200 L/L, the amount of chlorine injected is 5 ⁇ l ( ⁇ g/g; when the water content in circulating hydrogen is 50 ⁇ 100 L/L, the amount of chlorine injected) It is 2 to 5 g/g.
  • the chloride used for chlorine injection is preferably a halogenated alkane or a halogenated alkene such as dichloroethane, trichloroethane, tetrachloroethylene, tetrachloropropene or carbon tetrachloride.
  • Step (2) of the embodiment is a constant temperature control process which maintains a lower amount of sulfide introduced into the reaction system, and the ratio of the total sulfur amount of the introduced system to the reforming feedstock is controlled to 0.2 to 0.5 g. /g, the reaction temperature is raised to the desired reforming reaction temperature after the water content in the circulating gas is reduced to a prescribed value, and the preferred method of operation is when the water in the circulating gas is contained After the amount is less than 200 ⁇ ! ⁇ , the reaction temperature is raised to 460 ⁇ 490 °C, and the drainage is continued at this temperature. When the water content in the circulating gas is lower than 5 ( ⁇ L/L, the reforming is carried out according to the design amount.
  • the raw material is raised according to the octane number of the liquid product, and the reaction temperature is generally raised to 490 to 545 ° C to carry out a normal reforming operation.
  • the pressure for controlling the reforming reaction during operation is 0.1 to 5.0 MPa.
  • the molar ratio of hydrogen to feedstock oil is from 1 to 20, preferably from 2 to 10;
  • the feed hourly space velocity (LHSV) is l lOhf 1 , preferably from 1 to 5 hr -
  • the feed amount of the reformate feedstock in the step (1) of the embodiment is generally lower than the design feed amount of the apparatus, preferably from 50 to 75 mass% of the reformer design feed amount.
  • the reforming raw oil is introduced into the reforming unit according to the design amount of the reforming device in the step (2) for the normal reforming reaction.
  • the recycle gas refers to a gas which is recycled to the reaction system after the reforming reaction product is gas-liquid separated, and is mainly hydrogen.
  • the gas before the oil feed refers to the gas circulating in the system, and the recycle gas is preferably hydrogen, an inert gas or a mixture of hydrogen and an inert gas, preferably nitrogen.
  • the reforming catalyst charged into the reaction system is preferably a series of double or multimetal catalysts containing platinum tin.
  • the reforming catalyst comprises a carrier and 0.01% by mass, preferably 0.1 to 1.0% by mass, based on the dry carrier, of a platinum group metal, 0.01 to 5.0% by mass, preferably 0.12.0% by mass of tin and 0.1 to 10% by mass, preferably 0.15.0% by mass of halogen;
  • the platinum group metal is platinum, rhodium, palladium, iridium, ruthenium or osmium, preferably platinum, preferably chloro
  • the carrier is preferably alumina, more preferably ⁇ -oxidation aluminum.
  • it may further contain a third and/or a ruthenium metal component selected from the group consisting of ruthenium, osmium, titanium and the like to further improve the catalytic performance of the catalyst, and the content of the third and/or ruthenium metal component in the catalyst is 0.01 to 5.0 mass.
  • % is preferably 0.05 to 3.0% by mass, and more preferably 0.1 to 2.0% by mass.
  • the continuous reforming apparatus described in the method of the present invention is a variety of moving bed continuous regenerative catalytic reforming units.
  • the continuously reformed feedstock oil may be straight run naphtha, hydrocracked heavy naphtha, hydrocoking gasoline, ethylene cracked gasoline raffinate oil, catalytically cracked gasoline, or a mixture of several of the raw materials.
  • the range of the distillation range controlled by the feedstock varies depending on the target product.
  • the initial boiling point of the feedstock oil is generally 60 to 95 ° C, and the final boiling point is generally 135 to 180 °C.
  • the impurities of the reforming feedstock are: ⁇ 0.5 g/g, nitrogen ⁇ 0.5 g/g, arsenic ⁇ lng/g, H0ng/g, copper ⁇ 101 ⁇ , water ⁇ 5.
  • the reforming device passivation method of the invention is suitable for the continuous regenerative reforming device of the platinum tin series catalyst, and is particularly suitable for the first use process of the new continuous reforming device.
  • the invention is further illustrated by the following examples, but the invention is not limited thereto. Example 1
  • the reforming catalyst was packed in a continuous reforming unit containing 0.29% by mass of platinum, 0.31% by mass of tin, and the balance being ⁇ -alumina.
  • the continuous reforming unit was first replaced with nitrogen having a purity of 99.8 mol% until the oxygen content of the exhaust gas was less than 0.5 mol%, and then the system was replaced with hydrogen having a purity of 96 mol% to a hydrogen content of the exhaust gas of more than 90 mol%.
  • the pressure of the reforming high-pressure separator was pressurized with hydrogen to 350 KPa, and the reforming compressor cycle was started so that the circulating gas volume was 5 x 10 4 Nm 3 /h. After each reactor was heated at a rate of 20 to 40 ° C per hour until the inlet temperature of the reactor was 200 ° C, the injection of dimethyl diether into the recycle gas was started and the temperature was further increased, and the dimercapto sulphate was charged.
  • the content of ruthenium in the recycle gas is 3 ⁇ 5xl (T 6 L/L.
  • T 6 L/L the content of ruthenium in the recycle gas
  • the inlet temperature of the reactor is raised to 370 °C, the temperature is kept constant for 3 hours, then the sulphur injection is stopped, and the system is replaced with hydrogen with a purity of 96 mol%.
  • the content of 3 ⁇ 4 in the recycle gas is reduced to 2x l (below T 6 L/L, and then the reforming feedstock is introduced to carry out the reforming reaction.
  • the composition of the reforming feedstock is shown in Table 1.
  • the reaction conditions and results are shown in Table 2. No carbon block was observed during sampling, and no coking was observed in the high temperature parts such as the shutdown check reactor. Comparative Example 1
  • the reforming catalyst was charged in a continuous reforming unit having the same composition as in Example 1.
  • the continuous reforming unit was first replaced with nitrogen having a purity of 99.8 mol% until the oxygen content of the exhaust gas was less than 0.5 mol%, and then the system was replaced with hydrogen having a purity of 93 mol% to a hydrogen content of the exhaust gas of more than 60 mol%.
  • the pressure of the reforming high-pressure separator was pressurized to 350 KPa with hydrogen, and the reforming compressor cycle was started to make the circulating gas flow rate 4 ⁇ 10 4 Nm 3 /h, and the respective reactors were heated at a rate of 20 to 40 ° C per hour. To 370 ° C.
  • the reforming feedstock oil was introduced into the reforming reactor, and its composition is shown in Table 1.
  • the dimethyl disulfide is injected into the raw material to make the sulfur content in the raw material 0.2 to 0.3 g/g, and then the reaction is carried out under the normal operation of the reforming operation conditions, the main operating conditions and the reaction results. See Table 2.
  • the catalyst sample is collected from the separation hopper after the reformer is operated for 3 months, the carbon block of 1 ⁇ 5mm size is often found.
  • the electron micrographs of the carbon block sample are shown in Figure 1 and Figure 2 respectively. The photo shows that the carbon block is on the top. Filamentous carbon of iron particles.
  • Table 1 Table 1
  • the average pressure of the reaction system for controlling the continuous reformer is 0.45 MPa, and the high partial pressure is 0.34 MPa.
  • the catalyst amount of the reaction system was 50060 kg, which contained 0.28% by mass of platinum, 0.31% by mass of tin, and 1.10% by mass of chlorine.
  • the naphtha shown in Table 3 was used as a raw material.
  • the reactor temperature is raised to 490 Torr and dehydrated at this temperature, while dehydrating, the amount of chlorine injected is gradually lowered according to the water content in the circulating gas.
  • the water in the recycle gas is less than 50 L/L
  • the feed amount is gradually increased to 95 ton / hr, and the inlet temperature of each reactor is reformed to 530 °C.
  • the continuous reforming unit described in Comparative Example 2 was normally shut down, overhauled, unloaded, the inside of the reactor was cleaned, and a small amount of small carbon particles in the catalyst was separated by sieving and gravity sedimentation, and the catalyst was recharged. After the production.
  • the reforming feedstock and catalyst described in Comparative Example 2 were used. After checking the system for hydrogen gas tightness, start the hydrogen cycle and start to warm the reaction system at a rate of 40 ⁇ 50 / hour.
  • the reforming feedstock is started, and the feed amount is 57 ton / hr, while raising the reactor to 480 ° C at a rate of 20 ⁇ 30 ° C / hour, while heating, inject dimethyl disulfide and tetrachloroethylene into the reforming feed, and control
  • the reforming feed had a sulfur content of 6.0 g/g. After the sulfide was injected into the raw material, the concentration of hydrogen sulfide in the reforming cycle gas was analyzed every two hours.
  • the concentration of hydrogen sulfide in the recycle gas reaches 2 L/L
  • the amount of sulfide injected is lowered to a sulfur content of 0.2 to 0.5 g/g in the reforming feed.
  • the water content in the reforming cycle gas is lower than 20 ( ⁇ L/L, the reactor temperature is raised to 490 °C and dehydrated at this temperature, while dehydrating, the amount of chlorine injected is gradually reduced according to the water content in the circulating gas.
  • the reforming feed amount is gradually increased to 95 ton / hr, and the reforming reactor inlet temperature is raised to 530 ° C.
  • Example 4 According to the method of Example 2, the continuous reforming device was normally shut down for maintenance and unloading, and the reaction was started after the catalyst was charged. The difference was that the sulfur injection amount in the reforming reaction raw material after the reforming reactor was fed was 10 g/g. The main operating conditions and reaction results of each reactor after normal operation are shown in Table 4. Example 4
  • the continuous reforming device was normally shut down for maintenance and unloading, and the reaction was started after the catalyst was charged.
  • the difference was that the reforming reactor did not inject organic sulfur compounds into the raw material oil after the feeding, but the reforming was carried out.
  • the pre-hydrogenation tail gas is introduced into the reforming system, the sulfur content in the tail gas is 550 ⁇ 7 ⁇ , the hydrogen purity is 94%, the introduction flow rate is controlled at 500-550 Nm 3 /h, and the ratio of sulfur introduced into the system to the reforming feedstock entering the system is 4 g/g, when the concentration of hydrogen sulfide in the recycle gas of the reformer reaches 2 ⁇ 7 ⁇ , the introduction flow rate of the pre-hydrogenated tail gas is controlled to 30 ⁇ 40Nm 3 /h, that is, the total sulfur content of the introduced system is lowered to the reforming feedstock oil.
  • the ratio is 0.3 to 0.5 g/g.
  • the reactivity of the catalyst in the process of the present invention was not affected by the high sulfur content in the feedstock oil at the initial stage of the reaction as compared with the result of the reaction of Comparative Example 2. After the unit was put into operation for one year, the reaction and recycling system was operating normally. When the catalyst sample was collected from the separation hopper, no carbon block of the filamentous carbon was found, and the catalyst and the heating tube did not undergo metal catalytic coking. Alkane 49.78 group composition, mass% cycloalkane 41.94 aromatics 8.24

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Abstract

L'invention concerne un procédé de pré-désactivation préalable à la réaction d'un appareil de reformage en continu, qui comprend le chargement d'un catalyseur de reformage dans l'appareil de reformage en continu, le lancement d'un recyclage du gaz et l'augmentation de la température du réacteur, l'introduction de sulfure dans le gaz et le contrôle de la teneur en soufre dans le gaz recyclé dans une plage de 0,5 à 100×10-6 L/L lorsque la température du réacteur se trouve dans une plage de 100 à 650°C, l'appareil étant désactivé par ce procédé. Un procédé de désactivation pendant la réaction initiale d'un appareil de reformage en continu comprend les étapes suivantes : (1) chargement du catalyseur de reformage dans l'appareil de reformage en continu, lancement du recyclage du gaz et augmentation de la température du réacteur, introduction de l'alimentation de reformage dans le système de réaction lorsque la température du réacteur a été augmentée à 300-460°C, et en même temps ou ensuite, introduction de sulfure dans le système de réaction, le rapport entre la teneur totale en soufre introduit dans le système et l'alimentation de reformage étant contrôlé entre plus de 0,5 μg/g et 50 μg/g - lorsque le niveau de sulfure d'hydrogène dans le gaz recyclé atteint 2,0 μL/L à 30 μL/L, la quantité de sulfure introduit dans le système doit être réduite, (2) maintien de la température du réacteur de reformage entre 460 et 490°C, la quantité totale de soufre introduit dans le système devant être contrôlée après que la teneur en eau dans le gaz recyclé est descendue en dessous de 50 μL/L, ajustement de la quantité chargée d'alimentation de reformage à une valeur définie et augmentation de la température de la réaction de reformage à 490-545°C selon l'indice d'octane souhaité du produit liquide, la réaction étant ensuite ramenée au fonctionnement normal.
PCT/CN2008/001819 2007-10-31 2008-10-30 Procédé de pré-désactivation et procédé de désactivation pendant la réaction initiale d'un appareil de reformage en continu Ceased WO2009067858A1 (fr)

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US12/740,458 US8475650B2 (en) 2007-10-31 2008-10-30 Pre-passivation process for a continuous reforming apparatus, and passivation process for a continuous reforming apparatus during the initial reaction
RU2010119051/04A RU2470065C2 (ru) 2007-10-31 2008-10-30 Способ пассивации для установки непрерывного риформинга (варианты)
EP08854893.8A EP2210929B1 (fr) 2007-10-31 2008-10-30 Processus de pre-passivation d'un appareil de reformage en continu

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CN200710176571A CN101423774B (zh) 2007-10-31 2007-10-31 一种连续重整装置初始反应的钝化方法
CN200710178229.4 2007-11-28
CN 200710178229 CN101445746B (zh) 2007-11-28 2007-11-28 一种连续重整装置的预钝化方法

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EP2210929A1 (fr) 2010-07-28
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US8475650B2 (en) 2013-07-02
RU2010119051A (ru) 2011-11-20
EP2910624B1 (fr) 2016-11-23
US20100282645A1 (en) 2010-11-11
EP2210929B1 (fr) 2016-11-23
EP2910624A1 (fr) 2015-08-26

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